Coupling circumstantial evidence with a preponderance of the evidence can often make a sad day in court for the loosing party whom the circumstantial evidence was presented against.
Also coupling circumstantial evidence with human error and misinterpretation can lead an unsuspecting defendant into a can or worms. The law should most likely maintain that the bar for the standard for presenting circumstantial evidence should be raised. Without a proper defense to refute the allegations, the jury has no basis in fact. Case law may be of little use to the defense since that is where the courts get their freedom to convict on such lax, often dreamed up, crap.
Please excuse the french but not the oxymoron: (freedom to convict).
No, it is not a bad word, it is derived from Mr.Crapper, the inventor of the flushing toilet)